00f5c7797e
* mw/kubernetes: remove federation and cidr Remove both as we have a corefile syntax change that handles cidr and remove federation because that is going to be its own middleware. * backwards incompat changes This PR: * removes cidr from kubernetes (core Corefile feature now) * removes federation from kubernets (comes back as new middleware) * [remove autopath - which was already gone, so that already was backwards incompat] * adds `fallthrough` to the *etcd* middleware and makes you enable it. * Fail on unknown properties * documentation * Disable TestHealthCheck as it uses realtime and fails
95 lines
2.8 KiB
Go
95 lines
2.8 KiB
Go
package kubernetes
|
|
|
|
import (
|
|
"errors"
|
|
|
|
"github.com/coredns/coredns/middleware"
|
|
"github.com/coredns/coredns/middleware/pkg/dnsutil"
|
|
"github.com/coredns/coredns/request"
|
|
|
|
"github.com/miekg/dns"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
// ServeDNS implements the middleware.Handler interface.
|
|
func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
|
|
state := request.Request{W: w, Req: r}
|
|
if state.QClass() != dns.ClassINET {
|
|
return dns.RcodeServerFailure, middleware.Error(k.Name(), errors.New("can only deal with ClassINET"))
|
|
}
|
|
|
|
m := new(dns.Msg)
|
|
m.SetReply(r)
|
|
m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
|
|
// Check that query matches one of the zones served by this middleware,
|
|
// otherwise delegate to the next in the pipeline.
|
|
zone := middleware.Zones(k.Zones).Matches(state.Name())
|
|
if zone == "" {
|
|
if k.Fallthrough {
|
|
return middleware.NextOrFailure(k.Name(), k.Next, ctx, w, r)
|
|
}
|
|
return dns.RcodeServerFailure, nil
|
|
}
|
|
|
|
state.Zone = zone
|
|
|
|
var (
|
|
records []dns.RR
|
|
extra []dns.RR
|
|
err error
|
|
)
|
|
|
|
switch state.Type() {
|
|
case "A":
|
|
records, _, err = middleware.A(&k, zone, state, nil, middleware.Options{})
|
|
case "AAAA":
|
|
records, _, err = middleware.AAAA(&k, zone, state, nil, middleware.Options{})
|
|
case "TXT":
|
|
records, _, err = middleware.TXT(&k, zone, state, middleware.Options{})
|
|
case "CNAME":
|
|
records, _, err = middleware.CNAME(&k, zone, state, middleware.Options{})
|
|
case "PTR":
|
|
records, _, err = middleware.PTR(&k, zone, state, middleware.Options{})
|
|
case "MX":
|
|
records, extra, _, err = middleware.MX(&k, zone, state, middleware.Options{})
|
|
case "SRV":
|
|
records, extra, _, err = middleware.SRV(&k, zone, state, middleware.Options{})
|
|
case "SOA":
|
|
records, _, err = middleware.SOA(&k, zone, state, middleware.Options{})
|
|
case "NS":
|
|
if state.Name() == zone {
|
|
records, extra, _, err = middleware.NS(&k, zone, state, middleware.Options{})
|
|
break
|
|
}
|
|
fallthrough
|
|
default:
|
|
// Do a fake A lookup, so we can distinguish between NODATA and NXDOMAIN
|
|
_, _, err = middleware.A(&k, zone, state, nil, middleware.Options{})
|
|
}
|
|
|
|
if k.IsNameError(err) {
|
|
if k.Fallthrough {
|
|
return middleware.NextOrFailure(k.Name(), k.Next, ctx, w, r)
|
|
}
|
|
return middleware.BackendError(&k, zone, dns.RcodeNameError, state, nil /*debug*/, nil /* err */, middleware.Options{})
|
|
}
|
|
if err != nil {
|
|
return dns.RcodeServerFailure, err
|
|
}
|
|
|
|
if len(records) == 0 {
|
|
return middleware.BackendError(&k, zone, dns.RcodeSuccess, state, nil /*debug*/, nil, middleware.Options{})
|
|
}
|
|
|
|
m.Answer = append(m.Answer, records...)
|
|
m.Extra = append(m.Extra, extra...)
|
|
|
|
m = dnsutil.Dedup(m)
|
|
state.SizeAndDo(m)
|
|
m, _ = state.Scrub(m)
|
|
w.WriteMsg(m)
|
|
return dns.RcodeSuccess, nil
|
|
}
|
|
|
|
// Name implements the Handler interface.
|
|
func (k Kubernetes) Name() string { return "kubernetes" }
|